When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram at right ... and generators to operate. In the Earth (see image below right), the ...

Essentially, the molten iron at the core of our planet helps to determine where Earth’s magnetic field downs down. A diagram showing how the Earth’s magnetic field points downward and also how ...

Earth’s magnetism is pretty easy to forget about, being invisible to the human eye and all that. But it’s more important than you might think. The Earth acts like a giant bar magnet ...